We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
SENSITOMETRY 125
It is not sufficient simply to produce an H and D curve. A complete study of an emulsion or of a developer involves the developments of similarly exposed sensitome'tric strips for various times in a given solution. These strips, after plotting, are computed for gamma. From these gamma values, and from the times of development given, the relationship between time of development and gamma can be studied. Figure VI shows a typical series of H and D curves developed in a given developer for a series of times. Along with these curves is the gamma-time of development curve referred to above. From such a curve it is possible to determine the time of development necessary to produce any desired gamma within the range of that emulsion for that developer. Naturally, different types of emulsions in the same developer would produce curves of different shape. Also a given emulsion in various developers would produce time-gamma curves of different shape.
The facts brought out in this article only sketchily cover the subject but it is hoped that it will lead those not involved in the practical applications of sensitometry to realize the necessity of such studies. It is a fact that the practical applications of sensitometry have played a great part in the successful production of the present day high quality talking pictures and that furthermore, outside of advances in the equipment necessary to produce talking pictures, more advances will be made when sensitometry is more generally understood and practiced.